I don't know where you got those names for the shapes, but looks to me like they'd just confuse things.

The minor pentatonic scale is just the minor scale with the 2nd and 6th degrees omitted.

If you take the second shape in your list, and change the name from 'E minor pentatonic shape' to '1st position of the minor pentatonic', then whatever note the lowest note on your low E string lands on is your root note. So if you want to play A min pent put this shape so the lowest note on the E string is at the 5th fret (A)

If you take the third shape in your list, and change the name from 'D minor pentatonic shape' to '2nd position of the minor pentatonic', then whatever note the lowest note on your low E string lands on is your the b3 of the minor pent, or the root note of the relative major pent. So if the lowest note on the E string is at the 8th fret (C) you'll either be playing C Major pentatonic, or A minor pentatonic, depending on the backing and what note you resolve to.

I would urge you to learn the major scale though - once you understand the major scale you'll be able to see how other scales are related to it, and then they'll start to make a lot more sense.

Edit: Don't worry about shapes the major scale makes on the neck yet. Learn it in terms of notes and intervals, then learn to play it single string. Once you are comfortable with it single string and know what it should sound like, try playing it 3nps.